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Stockholders' Equity (Details) (USD $)
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0 Months Ended | 6 Months Ended | 6 Months Ended | 0 Months Ended | 60 Months Ended | 6 Months Ended | |||||||||||||||
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Apr. 30, 2013
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Mar. 27, 2013
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Jan. 29, 2013
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Jun. 30, 2013
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Jun. 18, 2013
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Dec. 31, 2012
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Jun. 30, 2013
Atm Program [Member]
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Jun. 30, 2013
Issued in conjunction with debt exchange for 3.75% exchangeable senior notes [Member]
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Jun. 30, 2013
Quarter 4 2012 [Member]
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Jun. 30, 2013
Quarter 1 2013 [Member]
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Jun. 30, 2013
Quarter 2 2013 [Member]
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May 15, 2013
Series B Cumulative Redeemable Preferred Stock [Member]
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Mar. 26, 2018
Series B Cumulative Redeemable Preferred Stock [Member]
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Mar. 27, 2018
Series B Cumulative Redeemable Preferred Stock [Member]
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Jun. 30, 2013
Series B Cumulative Redeemable Preferred Stock [Member]
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Jun. 18, 2013
Series B Cumulative Redeemable Preferred Stock [Member]
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Dec. 31, 2012
Series B Cumulative Redeemable Preferred Stock [Member]
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Jun. 30, 2013
Series B Cumulative Redeemable Preferred Stock [Member]
Quarter 2 2013 [Member]
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Jun. 30, 2013
Series B Cumulative Redeemable Preferred Stock [Member]
Quarter 3 2013 [Member]
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Mar. 27, 2018
Depository shares of Series B Cumulative Redeemable Preferred [Member]
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Jun. 30, 2013
Depository shares of Series B Cumulative Redeemable Preferred [Member]
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| Class of Stock [Line Items] | |||||||||||||||||||||
| Common stock, shares outstanding | 152,384,740 | 151,601,209 | |||||||||||||||||||
| At the market stock offering program, aggregate value of common stock | $ 600,000,000 | ||||||||||||||||||||
| At the market stock offering program remaining amount available for issuance | 305,300,000 | ||||||||||||||||||||
| Shares of its Common Stock in connection with the redemption of an equal number of OP Units | 333,997 | ||||||||||||||||||||
| Dividend payable date | Jan. 29, 2013 | Apr. 30, 2013 | Jul. 31, 2013 | May 15, 2013 | Aug. 15, 2013 | ||||||||||||||||
| Dividend paid on common stock (in dollars per share) | $ 0.65 | $ 0.65 | $ 17.8646 | ||||||||||||||||||
| Dividend shareholder of record date | Dec. 31, 2012 | Mar. 29, 2013 | Jun. 28, 2013 | Aug. 05, 2013 | |||||||||||||||||
| Dividends payable, date declared | Jun. 18, 2013 | Jun. 18, 2013 | |||||||||||||||||||
| Dividends Payable, Amount Per Share | $ 0.65 | $ 32.8125 | |||||||||||||||||||
| Series B, Shares Outstanding | 80,000 | 0 | 8,000,000 | ||||||||||||||||||
| Series B, Dividend Rate, Percentage | 5.25% | ||||||||||||||||||||
| Series B, Liquidation Preference Per Share | $ 2,500.00 | $ 2,500.00 | $ 0 | $ 25.00 | $ 25.00 | ||||||||||||||||
| Proceeds from Issuance of Series B | $ 193,900,000 | $ 193,920,000 | |||||||||||||||||||
| Ratio of depository shares to shares of Series B Preferred Stock | 0.01 | ||||||||||||||||||||
| Shares issued in conjunction with exchange of 3.75% exchangeable senior notes | 419,116 | ||||||||||||||||||||
| Coupon/Stated Rate | 3.75% | ||||||||||||||||||||